Actually, it is/was: post-WW2 there was no deflationary period.
And in general, post-WW2, wild swings as illustrated rarely happened. This is because we have monetary flexibility (i.e., no gold standard) and fiscal tools (Keynesian economics).
Post-2008 tried really hard to be a deflationary period. Instead, the Fed intervened ($4 trillion evaporated, and the Fed created another $4 trillion through QE), and we got a flat decade. Compared to the 1930s, that was a massive step up.
